139 
196 adults examined, only two larvae were found to contain 
develop in sterilized faeces to which larvae of both H. muscae 
and H. microstoma had been added. 
: In experiment 15, of 28 flies examined 15 were found 
infested with worm larvae. In Table 5 particulars are given of 
6 larvae obtained from these flies. Hill believes that 4 of 
these larvae, specimens 3-6, are larvae of H. microstoma. The 
Nevertheless, one does not doubt the possibility of M. 
domestica acting as an intermedi fe) . microstoma, 
— evidence is required before proof of such is estab- 
In commenting on the present writer’s preliminary 
observations, Hill (p. 62) casts doubts upon the results 
certainty between the final larval stage of H. muscae and that 
of H. megastoma 
regard to the length of the oesophagus. His inference, there- 
fore, that the present writer was not dealing with pure cultures 
cannot be held to be correct. 
The fact that Hill (p. 64) failed to satisfy himself as to 
pum ed from conjunctival 
hal o 
sp ronemic granulomata than the larvae of the other two 
